The news special aired at 8 p.m. on Saturday, one of the least-watched hours in broadcast TV. And that may have contributed to a relative dearth of top advertisers appearing to support the show. During the hour, commercial breaks were largely filled with spots from direct-response advertisers, including the dietary supplement SuperBeets; the home-repair service HomeServe.com; and CarFax, a supplier of auto ownership data. Viewers of the telecast on WCBS, CBS’ flagship station in New York, even saw a commercial for Chia Pet, the terra-cotta figure that sprouts plant life after a few weeks.